Authorities on Tuesday identified the woman killed in a single-vehicle crash in Vacaville a day earlier as 58-year-old Dara Edell of Fairfield.

Edell was driving eastbound on Interstate 80 approaching the Davis Street exit around 12:30 p.m. when she lost control of her 2000 Honda Accord, which swerved off the freeway and overturned onto a frontage road, according to the California Highway Patrol.

Witnesses reported Edell was traveling approximately 65 mph when, for unknown reasons, she allowed her car to drift to the right and eventually onto the right-hand shoulder, authorities said. Her vehicle went up the small embankment separating the freeway from Bella Vista Avenue, which parallels I-80, narrowly missing a guard rail and sheered off a tree before overturning.

The car came to a rest on its wheels on the frontage road facing west.

Edell, who was wearing a seat belt, was pronounced dead at the scene by a paramedic, the CHP said.

The cause of the crash is still under investigation, according to CHP Public Information Officer Chris Parker. Anyone with information is asked to contact the CHP at 428-2100.

Parker noted that alcohol is not believed to have been a factor, but that toxicology results are still pending from the Solano County Coroner's Office.